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DESCRIPTION JPS6089886

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DESCRIPTION JPS6089886
[0001]
The present invention relates to a microphone built-in type tape recorder, and it is an object of
the present invention to provide a tape recorder capable of monitoring the recording state with
an e-phone or headphones when recording using a built-in microphone. . In general, in the tape
recorder with built-in microphone, a muting circuit is provided in the main amplifier for driving
the speaker to eliminate the problem of howling with the built-in speaker when recording using
the built-in microphone The above muting circuit is configured to operate in the above recording
state. However, in the tape recorder having such a configuration, a speaker and a jack for an
earphone or a headphone are usually provided on the output side of the main amplifier, and for
this reason, it is not possible to even monitor recording with the earphone or the headphone.
Met. The present invention solves such conventional drawbacks, and the present invention will
be described below with reference to the drawings of the embodiments. The figure shows one
embodiment of the tape recorder of the present invention. In the figure, 1 and 2 are left and right
magnetic heads, and 3 is a condenser microphone as a built-in microphone. The signal from the
built-in microphone 3 is applied to the left and right recording equalizer amplifiers 6.7 through
the left and right microphone amplifiers 4 and 5 respectively, and recorded on the magnetic tape
(not shown) by the left and right magnetic heads 1 and 2 . Further, the recording / reproduction
switching switch SW4 is switched to the recording position R, and the microphone signal is
recorded together with the signal from the bias oscillation circuit 8 by supplying power to the
bias oscillation circuit 8. On the other hand, the radio-tape changeover switches Sw1 to SW3 are
respectively switched to the tape position T, and the signal from the built-in microphone 3 is
applied to the left and right headphone amplifiers 12.13 through the changeover switch Sw + 1
S12. The respective outputs of the left and right headphone amplifiers 12.13 are connected to
contact pieces 9a and 9b constituting the stereo headphone jack 9, and the respective inputs of
the left and right headphone amplifiers 12.13 are the stereo headphone jack 9 described above.
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Switch contact piece 9c to constitute. Connected to 9d. The switch contact piece 9e in contact
with the contact piece 9a constituting the above-described stereophonic jack и jack 9 is connected
to the speaker 1 drive main amplifier 10 via the resistor R1. 11 is a built-in speaker driven by the
main amplifier 10 described above.
TR is a muting transistor whose collector is connected to the input side of the main amplifier 10
and whose emitter is grounded, and is connected to the tape position T of the changeover switch
F3w5 at its base via a resistor R2 . Therefore, the signals from the left and right microphone
amplifiers 4 and 5 are synthesized and added to the left and right headphone amplifiers 12.13,
and the above-mentioned contact piece is obtained when the stereo headphone plug is not
inserted into the above-mentioned stereo headphone jack 9. The microphone signal is taken out
only from 9a '. In the tape recorder having such a configuration, when the tape-radio changeover
switches SIN to Sv are put in the tape position and the recording / reproduction changeover
switch 3w4 is put in the recording position R as shown in the figure, the muting transistors Since
the power source B is added to the base of TH via the resistor R2, the transformer lTR is in a
conducting state, and the microphone signal taken out to the contact piece 9c constituting the
stereo headphone jack 9 is a music signal, And not be added to the main amplifier 10. Therefore,
although the internal microphone 11 and the local microphone 3 are used for recording, the
internal / internal speaker 11 is not driven, and no howling occurs. By the way, when the stereo
headphone plug is inserted into the stereo headphone jack 9 in the above-described recording
state, the switch contact pieces 9 c, 9 d and 9 a. The microphone signal amplified at the
headphone amplifier 12 ░ 13 can be recorded and monitored by stereo headphones. In addition,
even when the recording / reproduction switching switch SW4 is in the reproduction position
and the radio tape switching switches 81N to SWS are in the tape position T at the time of
reproduction, the power source B is not added to the base of the muting transistor TR. It is
possible to listen to the reproduced sound by either the built-in speaker or the stereo headphone.
In addition, when the radio-tape switching switches SWI to sw3 are at the radio position R, the
muting transistor TR is in a non-moving state, and either of the built-in speaker or the stereo
headphone can be used for listening. Although the above embodiment has been described as
using stereo headphones, it is needless to say that this may be earbuds. Also, the number of main
amplifiers 10 is not limited to one, and one more circuit can be added to the stereo headphone
jack. In this case, a muting circuit may be provided on the input side of the added main amplifier.
As described above, according to the present invention, the jack is provided between the
headphone amplifier and the main amplifier for driving the speaker, and the main amplifier is
provided with the muting circuit responsive to the recording / reproduction switching switch. In
the state, the problem of howling with the built-in speaker can be eliminated, and furthermore,
the recording monitoring can be performed with the earphone or headphone connected to the
jack.
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[0002]
Brief description of the drawings
[0003]
The drawing is a circuit diagram showing an embodiment of a tape recorder according to the
present invention.
1.2 ииииии Magnetic head, 3 и и и и и и и Built-in microphone, 4, и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
recording equalizer amplifier, 8 и и и ииииииии Bias oscillation circuit, 9 иииииии Jack, 10 иииииии Main amplifier,
11 ииииииииииииииии 12.13 иииииииииииииииииииииииииииииииииииииииииииии Headphone amplifier, Sll ~ Sws ииииииииии Tape-radio switch,
Sv, ииииииии Recording and changeover switch.
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